Re: not all mail arrives... a lot of real mail rejected

Re: not all mail arrives... a lot of real mail rejected

It will reject mail which arrived first time with 4xx soft bounce code, a normal MTA will retry deliver this mail several minutes later.Three times later, your mail server will accept this mail and deliver to user's mailbox.

Greylist is spam-killer. Please try to understand it and then decide to enable it or not.